Conference Agenda

This study seeks to examine the mechanical properties of adobe compacted with wheat straw, pine needles and their mixtures in proportions of 0.3%, 0.5% and 0.8% subjected to compression and bending. Earth from the Cruz Blanca quarry in Cajamarca was used. Moisture content tests, granulometric analysis, plasticity limits, relative specific gravity of solids and modified proctor were carried out. Knowing the properties of the material, 120 samples of compacted adobe were manufactured with the CINVA RAM machine, drying for 28 days before performing compression and bending tests, obtaining positive results. In the compression test, adobes with 0.3%, 0.5% and 0.8% wheat straw showed increases of 47.08%, 68.16% and 27.29%, while with pine needles the increases were 26.63%, 41.87% and 45.12%. By combining both, an increase of 28.44%, 45.27% and 66.49% was achieved. For the bending tests, increments of 0.3%, 0.5% and 0.8% of wheat straw were used, obtaining values of 5.06% and 9.27%. and 60.67%, when adding pine needles the values 21.07%, 25.28% and 52.81 are obtained, and finally for the combination of elements the values 49.72%, 57.87% and 44.94% are presented. So we come to the conclusion that we have validated the hypothesis, these values satisfy the minimum requirements established by the standard.

The present study aims to evaluate the potential of the bacterium Bacillus subtilis for the self-repair of cracked concrete (concrete with compressive strength of 210 kg/cm²) by the process of calcium carbonate bioprecipitation. Microbiological and physicochemical evaluations of the bacterial strain used were carried out, as well as quality control of the construction materials, specifically fine and coarse aggregates, for the design of the concrete mix. In the laboratory, the bacterium Bacillus subtilis was characterized under different pH. Mechanical compression and bending tests were performed on cylindrical, prismatic and cubic specimens, to evaluate the effectiveness of the repair system based on the mechanical properties and self-healing capacity of the concrete. The results showed that calcium carbonate bioprecipitation allowed the repair of fissures up to 0.15 mm wide in a period of 7 days. In conclusion, calcium carbonate bioprecipitation mediated by Bacillus subtilis is presented as an effective alternative for the self-repair of fissures in concrete f'c 210 kg/cm², especially in alkaline conditions, which makes it a possible solution for urban and industrial structures.

The present study proposes the use of the bacterium Bacillus subtilis as an innovative solution to improve the self-healing properties of concrete with a design strength of F'c 210 kg/cm². Microbiological analyses were performed with the gram-positive bacterium Bacillus subtilis, along with quality controls of the materials used in the mixture (fine and coarse aggregates). Likewise, mechanical compression and bending tests were carried out on different types of concrete specimens (cylindrical and prismatic) to analyze their ability to self-repair fissures and cracks. The results demonstrated a crack width repair of up to 1.41 mm over a 36-day period. In addition, it was determined that as the curing days increase, the structure is strengthened, increasing its resistance. In summary, the bioprecipitation of calcium carbonate by the bacterium Bacillus subtilis in concrete F'c 210 kg/cm2, is emerging as a sustainable and efficient solution for the self-repair of fissures and cracks in urban and industrial concrete structures.

This study focuses on improving the stability of the subgrade of the road between Ancos and El Porvenir, in the district of Santa Rosa, Áncash, by incorporating a mixture of lime and cement to reduce the low cohesion of the soil during the rainy season. The problem arises from the deterioration of the terrain during humid periods, compromising the safe transit of people and vehicles. The main objective is to analyze the impact of stabilization on soil cohesion and bearing capacity by evaluating changes in consistency limits and the California Bearing Ratio (CBR).The methodology follows a quantitative and experimental approach, with laboratory tests using different percentages of lime and cement to measure changes in soil plasticity, density, and strength. Two representative soil types were selected: one clayey-sandy and another highly plastic. The results show that the addition of lime and cement reduces plasticity and significantly improves the CBR, especially in clayey-sandy soils. However, in highly plastic soils, the effectiveness is more limited, suggesting the need for complementary treatments to achieve significant improvements.

Abstract– The purpose of this work was to analyze the social and economic impact of road infrastructure projects in Honduras, in order to propose the inclusion of a specific budget item for social impact in future infrastructure works. The general objective of the research was to evaluate how these projects improve access to services, mobility, and economic opportunities in the benefiting communities. The methodology employed combined a social impact analysis with a cost-benefit evaluation, using surveys and quantitative analysis of socioeconomic data. The results showed that, in addition to improving connectivity, the roads contributed to economic and social development in the areas of influence, enhancing the quality of life in the communities. The main conclusion emphasized the importance of considering a budget allocated for social impact, recommending that institutions integrate this approach into the planning of future infrastructures to maximize community benefits and ensure the sustainability of the projects.

The use of construction waste as a partial replacement for traditional materials is a sustainable alternative in the construction industry. This study evaluated the influence of partially replacing fine aggregate with construction waste in concrete for rigid pavements in the San Pedro Human Settlement, using a quantitative approach and an experimental design. Mixtures with substitution levels of 0%, 20%, 40%, and 60% were analyzed through compression strength tests, granulometry, and bulk density measurements. The results showed that a 20% substitution significantly improves compressive strength, exceeding 200 kg/cm² at 28 days, while higher substitution percentages reduce this property. In conclusion, incorporating 20% construction waste is the optimal option to balance sustainability and structural performance in rigid pavements.